Susan G. Buto Don Sweetkind 20070601 vector digital data Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?ds273_HA_StudyArea James R. Harrill Joseph S. Gates James M. Thomas 1988 map 1:1,000,000-scale, 2 sheets U.S. Geological Survey Hydrologic Investigations Atlas HA-694-C Reston, VA U.S. Geological Survey http://pubs.er.usgs.gov/usgspubs/ha/ha694C Carson City, NV 2007 Carson City, Nevada Nevada Division of Water Resources http://pubs.usgs.gov/ds/2007/273/ This data set consists of sub delineations of the hydrographic area (HA) boundaries and polygons drawn at 1:1,000,000 scale for the Great Basin supplemented by information from HA drawn at 1:750,000 scale where necessary. See the process steps for more information. The intended uses of this data set include, but are not limited to, natural resource modeling, mapping, and visualization applications. 20070601 publication date Complete None planned -116.290057 -113.401735 40.398721 37.942424 HA Hydrographic Area inlandWaters none Nevada Utah Great Basin White Pine County eastern Nevada western Utah Basin and Range Butte Valley Cave Valley Jakes Valley Lake Valley Little Smoky Valley Long Valley Newark Valley Snake Valley Spring Valley Steptoe Valley Tippett Valley White River Valley None Although this Federal Geographic Data Committee (FGDC) compliant metadata file is intended to document the data set in nonproprietary form, as well as ArcGIS format, this metadata file may include some ArcGIS-specific terminology. These data are not intended to be used as a survey product and are for reference purposes only. Acknowledgment of the U.S. Geological Survey and the Bureau of Land Management would be appreciated in products derived from these data. U.S. Geological Survey Public Information Assistant mailing and physical address

2730 N. Deer Run Road

Carson City NV 89701 USA (775) 887-7600 (775) 887-7629 GS-W-NVpublic-info@usgs.gov Acknowledgement of the U.S. Geological Survey would be appreciated in products derived from these data. Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.2.1350 J.R. Harrill J.S. Gates J.M. Thomas M.D. Mifflin 1988 map U.S. Geological Survey Hydrologic Investigations AtlasU.S. Geological Survey Hydrologic Investigations Atlas HA-694-C Reston, VA U.S. Geological Survey Plate 3, 1:1,000,000-scale J.S. Rosenshein, ed P.R. Seaber, ed. 1988 document Geology of North America Volume 0-2 Boulder, CO Geological Society of North America F.E. Rush 1974 map Nevada Department of Conservation and Natural Resources, Division of Water Resources Map not applicable Carson City, NV Nevada Department of Conservation and Natural Resources, Division of Water Resources Welch, A.H. Bright, D.J. 2007 document Open-File Report 2007-1156 Reston, VA U.S. Geological Survey http://pubs.water.usgs.gov/ofr20071156 All attempts were made to compare 100 percent of the digital spatial data to the original source map. Verification was done by visual and manual comparison, combined with on-screen review, of the source with hard copy plots. Corrections were made until two comparisons determined 100 percent of the digital spatial data matched the original source map. The logical consistency topologically is clean. Polygon and chain-node topology is present. Using ArcGIS tools and routines, all polygons were checked for closure, sliver polygons, and duplicate features; all arcs were checked for node errors, overshoots, undershoots, dangles, intersections, and duplicate features. Complete at 1:1,000,000-scale for the Great Basin as defined by the source publication All attempts were made to compare 100 percent of the digital spatial data to the original source map. Verification was done by visual and manual comparison, combined with on-screen review, of the source with hard copy plots. Corrections were made until two comparisons determined 100 percent of the digital spatial data matched the original source map. 600 meters Errors resulting from the quality of the source map, the automation process, and the scale resolution can impact the accuracy of the data. The errors resulting from the quality of the source map and much of the automation process are unknown. The inherent error of a 1:1,000,000-scale map is approximately 508 meters according to the National Map Accuracy Standards of 1947. The RMS error during georeferencing was approximately 90 meters. The horizontal positional accuracy was verified by visual and manual comparison as described in the Horizontal_Positional_Accuracy_Report and the Process_Steps and matches the positional accuracy of the original source map. The horizontal positional error is deductively estimated at 600 meters. Not applicable. J.R. Harrill J.S. Gates J.M.Thomas 1988 map U.S. Geological Survey Hydrologic Investigations Atlas HA-694-C Reston, VA U.S. Geological Survey 1000000 paper 1988 publication date HA694C spatial and attribute information Lorri A. Peltz Rose L. Medina Susan G. Buto 2005 vector digital data Reston, VA U.S. Geological Survey http://water.usgs.gov/lookup/getspatial?nv_ha750nv F.E. Rush 1974 map Nevada Department of Conservation and Natural Resources, Division of Water Resources Map Not applicable Carson City, NV Nevada Department of Conservation and Natural Resources, Division of Water Resources 750000 digital vector data 2005 publication date HA750 spatial data HA694C sheet 2 was scanned at 400 dpi into tiff format. The tiff was georeferenced to digital tics representing the corners of 30 by 60 minute U.S. Geological Survey topographic quadrangles. Prior to georeferencing, the tic data were projected to Lambert conformal conic projection, North American Datum of 1927 (NAD27) with the parameters set as follows: > Central_Meridian: -96.000000 > Standard_Parallel_1: 33.000000 > Standard_Parallel_2: 45.000000 > Latitude_Of_Origin: 39.000000 Georeferencing was done using tools provided in ArcGIS 9.0. The image was rectified using first order polynomial transformation with an RMS error of approximately 90 meters. HA694C 20050407 The lines were digitized from the source using ArcScan where possible. The complexity of the source map resulted in most of the data being digitized using manual means. HA694C 2005 The hydrographic areas were compared with the index map from HA694C (sheet 1). Lines from HA750 were copied to the data set in areas where the index map indicated the presence of a hydrographic area but no lines were evident on the source map. Hydrographic area subdivisions from the index map were not used in three cases: 1. The index map on sheet 1 (HA694C) divides HA 103, Dayton Valley, into three subareas. The lines are not evident on sheet 2 and do not exist in HA750. These division lines were left out of the digital data. 2. The index map on sheet 1 (HA694C) divides HA 265, Utah Valley, into three subareas. The lines are not evident on sheet 2 and Utah HA are not available digitally from HA750. These division lines were left out of the digital data. 3. The index map on sheet 1 (HA694C) divides HA 33, Quinn River Valley, into three subareas. The lines for subarea C are not evident on sheet 2 and the HA are not available digitally from HA750. This division line was left out of the digital data. Topology tools were used to verify and correct the geodatabase topology until no errors remained in the data set. HA750 200506 The data set was projected from Lambert, NAD 27 to UTM, Zone 11, NAD 83 using the ArcGIS project tool. 1:1,000,000-scale hard copy plots of the data were generated and using a light table, these plots were visually and manually compared with HA694C. Corrections were made to the spatial data until two visual and manual comparisons, combined with on-screen review, determined there was no light between the original and digital lines. The attribute accuracy was verified by two visual and manual comparisons, combined with on-screen review, of plots with HA694C. HA694C and HA750 200506 ArcGIS tools were used to build polygons from the digitized lines. The polygons were attributed and the values checked until two comparisons indicated that the data were a fair representation of the source. HA694C 200506 The HA lines and polygons covering the BARCAS study area were selected from the original data set and copied to this data set. 20050627 Subbasins were delineated within each HA based on interbasin flow and sub-surface hydrogeology. 20060430 Vector G-polygon 30 String 692 Universal Transverse Mercator 11 0.999600 -117.000000 0.000000 500000.000000 0.000000 coordinate pair 0.000422 0.000422 meters North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 National Geodetic Vertical Datum of 1929 0.000010 meters Explicit elevation coordinate included with horizontal coordinates HA_StudyArea Hydrographic areas and flow system boundaries for the Basin and Range carbonate-rock aquifer system study area USGS OBJECTID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape_Length Length of feature in internal units. ESRI Positive real numbers that are automatically generated. Shape_Area Area of feature in internal units squared. ESRI Positive real numbers that are automatically generated. hyd_area Hydrographic area number USGS 154 Newark Valley USGS 155A Little Smoky Valley USGS 174 Jakes Valley USGS 175 Long Valley USGS 178B Butte Valley USGS 179 Steptoe Valley USGS 180 Cave Valley USGS 183 Lake Valley USGS 184 Spring Valley USGS 185 Tippett Valley USGS 207 White River Valley USGS 254 Snake Valley USGS hyd_area_name hydrographic area name USGS Newark Valley hydrographic area name USGS Little Smoky Valley hydrographic area name USGS Jakes Valley hydrographic area name USGS Long Valley hydrographic area name USGS Butte Valley hydrographic area name USGS Steptoe Valley hydrographic area name USGS Cave Valley hydrographic area name USGS Lake Valley hydrographic area name USGS Spring Valley hydrographic area name USGS Tippett Valley hydrographic area name USGS White River Valley hydrographic area name USGS Snake Valley hydrographic area name USGS flow_system Major ground-water flow system number USGS 29 Newark Valley System USGS 34 Colorado System USGS 35 Goshute Valley System USGS 37 Great Salt Lake Desert System USGS OBJECTID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry. ESRI Coordinates defining the features. flow_system_name Major ground-water flow system name USGS Newark Valley System flow system name USGS Colorado System flow system name USGS Goshute Valley System flow system name USGS Great Salt Lake Desert System flow system name USGS sub_hyd_area Concatenation of hydrographic area number and sub-basin number. Sub-basin numbers are from 01 to 05. For example, 15401 would be Newark Valley, first sub-basin. USGS Sub_Basin HA_StudyArea For the polygon feature classes: >hyd_area is the hydrographic area number >hyd_area_name is the hydrographic area name >subarea_name is the subarea name, when present >flow_system is the flow system number >flow_system_name is the flow system name >sub_hyd_area is the concatenation of the hydrographic number and sub-basin number none U.S. Geological Survey Ask USGS – Water Webserver Team Address mailing

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Reston VA 20192 1-888-275-8747 (1-888-ASK-USGS) http://water.usgs.gov/user_feedback_form.html Although this data set has been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data and related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of this data, software, or related materials. The use of firm, trade, or brand names in this report is for identification purposes only and does not constitute endorsement by the U.S. Geological Survey. The names mentioned in this document may be trademarks or registered trademarks of their respective trademark owners. Geodatabase 9.2 Geodatabase Spatial and attribute information WinZip 2 http://water.usgs.gov/GIS/dsdl/DS273_IrrigatedAcreage.zip Shapefile 2007 Spatial and attribute information WinZip 2 http://water.usgs.gov/GIS/dsdl/DS273_IrrigatedAcreage_Shape.zip None. This dataset is provided by USGS as a public service. 20051026 20070706 U.S. Geological Survey Ask USGS -- Water Webserver Team mailing

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Reston VA 20192 1-888-275-8747 (1-888-ASK-USGS) http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+ds273_HA_StudyArea FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998